test(ollama): keep slow gcp primary on ollama

apps/api/tests/test_ollama_failover_manager.py

@@ -132,11 +132,11 @@ class TestDecideRoute:
         assert "gemini" in provider_names
 
     # ------------------------------------------------------------------
-    # GCP-A SLOW → primary=Gemini（SSD 慢時仍切雲端）
+    # GCP-A SLOW → primary=GCP-A（高負載時仍優先保住本地/代理 Ollama）
     # ------------------------------------------------------------------
 
-    def test_gcp_a_slow_primary_is_gemini(self):
-        """GCP-A SLOW → primary=Gemini"""
+    def test_gcp_a_slow_primary_is_ollama_gcp_a(self):
+        """GCP-A SLOW → primary=GCP-A，避免過早切 Gemini"""
         manager = self._setup()
         h_gcp_a = _make_health(HealthStatus.SLOW, URL_GCP_A)
         h_gcp_b = _offline_health(URL_GCP_B)
@@ -151,7 +151,7 @@ class TestDecideRoute:
             url_local=URL_LOCAL,
         )
 
-        assert result.primary.provider_name == "gemini"
+        assert result.primary.provider_name == "ollama_gcp_a"
 
     # ------------------------------------------------------------------
     # GCP-A DEGRADED → primary=Gemini